Brake-testing machine



Feb. 19, 1929.

R.- F. DANN-:Ls

BRAKE'TESTING MACHINE Filed Feb. 15. 1928 3 Sheets-Sheet IlI 7M M wfg@ognowd 'Feb 19, 1929. 1,702,817

R. F. DANIELS l BRAKE TESTING MACHINE K Filed Feb. 15. 1928 ssheets-sheer 2 `lm n.5.

INVENToR. 5%?? @am MAM ATTORNEYS.

Feb, 19, 1929.l

R. F. DANIELS BRAKE TESTING MACHINE Filed Feb. l5. 1928 5 Sheets-Sheet if Aw A TTORNEYS.

Patented Feb. 19, 1929.

RICHARD F. DANIELS, OF ALAMEDA, CALIFORNIA.

BRAKE-TESTING- MACHINE.

Aprcationv filed February 15, 1928. Serial Np. 254,466.

effectiveness or etliciency ot automobile brakes.

ln carrying out the invention into practice, l provide i to he placed inengagement i .nobile nheel to revolve the ine nriinst the action o1:`its hralie.

Ation which is adapted to deflect during operation an amount in directproportion to the torque reipiired to revolve the Wheel. l Vmeasure thisdeflection hy `nieans et a sensitive device so that even slightvariations in resistance otter-ed by the wheel to turning` movement 'n'l he indicated.

One ilorin nl is ei-zernpliiied in the tollou'inggY description andillustrated by way ot' example in the accompanying drawings, in which:

litio'. 1 is a plan view ot a ln'alte testing ap parar-ns f-shon'inggtvvo testb units.

l? 2 a plan view oi' one of the testing` unitsshoivn with parts brokenaway and in section.

Fig. l is a perspective View of one oi the cams employed.

Fig. 1 is a central vertical section through one of the testing` unitstaken on line VWIV of Fig. 2.

Fig. 5 is a transverse sectional View taken on line V-V of Fig. 2.

G is a iragnientary view in central section thro gjh the fluid chainherused in connection with the indicator of the present device.

Reterriup` more particularly to the accompanying ch'awinpgs, in Fig. 1'l have shown a testine: device for two wheels of :in antonioiiile. Thistesting); device includes two testing); units A. and Vll one heine`provided :tor each wheel. lt to he understood that I may' enioody rnyapparatus in a machine for testine; all' tour Wheels it desired it isonly necessary to duplicate the apparatus illustrated in 1 and properlyspace it thereti in so that all teur Wheels of a vehicle nl ay he testedsimultaneously. However, the pres- Vvehicle Wheel.

icii the invention inay assunie ent application is particularlyconcerned with the testing` unit employed for each Wheel.

Each testing' unit comprises a traine 10 Which niay he ot any suitabledesign and construction. This traine supports an electric inetor 11 theshaft of which is fitted with a pinion 12. This pinion is in niesh witha gear 1&1 keyed or otherwise secured on a countorshatt 15. The electricinotor 11 and the countershftt 15 in the present instance is common toboth the units A and B.

Secured on the countershaift 15 is a pinion 1h which is in inash with agear 17 termed on or seciiired to a cani 18. This cani 18 is rotatablyand reeiprocably mounted on a shaft 19. This shaft is jonrna-lled insuitaole hearings and mounted thereon is a wheel 29 which constitutesineans for revolving` a That is, the Wheels ot the automobile aredisposed on the Wheels 2O of the dillerent testing units and the vehicleis anchored trein inovelnent so that the vehicle Wheels may he revolvedoy the wheels 2O Without inoveinentot the automobile.

Also secured on the shaft 19 is a cani 21 which is identical inconstruction with the cani 1S with the exception that it is of oppositehand and it is not :fitted with a gear. rl`he faces of these tivo earnsare contiguous and .re torinod in the nianner illustrated in Fig'. Thatis, the earns have tivo high points at dia-inetricaliy opposed sides andtivo low points arranged at 189 degrees apart and 99 lesjrces troni thehigh points olf the earns.

Mounted on the sl'iait 19 between the two earns 1S and 21 is a spindle22 which is adapted to revolve freely on the shaft 19. At its outer endsthis spindlecarries rollers 23 engaging the cani faces ot the Canis 18and 21. The cani 18 is yieldahly urged toward the lined cani 21 byineens of a spring' 2li interposed between the cani 18 and a collar 25.This collar is threaded on the shatt 19 so that it may he used to adjustthe tension of the spring),l 2st.

It is obvious that when the shaft 19 is driven that the cam 18 willthrough the inediuni ot' the rollers 23 drive the cani 21. It

no resistance is encountered to the driving `troni cani 18 to cam 21 andthe tivo will revolve in unison, revolving the Wheel 20.

Illl

' parting fromithe spirit ofthe invention as 'defined in the appendedclaims.

Having tlius described my inventiomnhat l claim and desir to secure byLetters Patu ent is:

l. A brake testing apparatusv comprising Wheel turninfbg` means adaptedto engage the wheel of an automobile te reve-life the same, a revelublemember relativelg'f lined to said wheel turning; means, a revolnblemember a-l'lapted to be driven and capable of yielding; axially, meansinterpos d between said memers adapted lo transmit the drive from theyielding member to the lined member and to cause said yielding' memberto yield en'ially in direct proportion to the resistance ofllered toturning movement by the Wheel, and indieating means operated by theyielding move ment of said yield-able men'iber.

Q. A Jralre testing apparatus comprising,y n'heel tin-ning` meansadapted to engage tbe wheel of an automobile to revolve the same, arevoluble member relatively lined to said Wheel turning,l means, arevoluble member adapted to be driven and capable of yielding axially,means interposed bet'-.veen said. incanbers adapted to transmit tbedrive from the yielding member to the fixed member and to cause saidyielding` member to yield axially in direct proportion to the resistanceofferefL to turning; movement by tbe wheel, and means operated by theyielding moven'ient of the vieldable member a greatly in reased ratio toindicate the yielding movement of' the yieldable member.

3. A brake testing' apparatus comprisirej `Wheel turningr means adaptedto engage the Wheel of an automobile o revolve the same against theaction of its brake, a member relatively fixed to tl Wheel turning'mea-ns, a yieldable n'iember adapted to be driven, a motor connected tosaid yieldable member to drive tbe same, means interposed betivi-en thefixed men'lber and 'l5-lie yicldablc member to transmit tbe drive to tbetinted nlember from tbe yieldable membe' and causing,v the yield ablemember to yield in directproportion to the torque required to turn theivlieel, and indicating` means operated by the yieldin, movement of saidyieldable member.

fi. la device 'for testing; automobile brakes comprising nf'lieelturning` means :da )led to eng-agro tbe Wheel of an automobile torevolve the same.y a driving' motor, Yflexible means transmifling thedrive 'from the motor to the wheel turning' means. said lleviblc meansbeinn` aiflapted to be deflected a distance in direet proportion to thetorque required to turn the wheel, a chamber containinnF a fluid,

a flexible di aplirajggm .forming one wall of said chamber, a calibratedgage glass connected with said chamber and in ivhicli the fluid levelchanges as the volume of the chamber is changed, and means operativelyassociated with said llexible means and said diaphragm id the volume ofsaid I wheel to turning, a fluid clmniber containing fluid, a gageconnected therewith, and means actuated by tbe deflection of saidflexible means to reduce the volume of the fluid elia-nn ber to causethe fluid toV rise in tbe and indicate the deflection of' said flexiblemeans.

(i. A brake testing' apparatus comprising; Wheel turning means adaptedto engage the n'heel of an automobile to revolve the same, a revolublemember relatively Vined to said Wheel turning' means, a revoluble memberadapted to be Ydriven and capable of yieliilii'igr axially, meansinterposed between said members adapted to transmit the drive from theyielding3- member to the fined member and to cause said yielding`men'iber to yield axially in direct proportion to tbe resistanceoffered. to turning' movement by the ivbeel, a chamber containing a.fiuid, a flexible diapbragm forniingr one Wall of said chamber, acalibrated nage dass connected .vith said chamber and in which the fluidlevel changes as the volume of the chamber is changed, and meansoperatively associated With said yieldable member and said diaphragm tochange the volume ot the chamber by yieldinb movement of said yieldablemember.

7. A. brake testing apparatus comprisingr Wheel turning means adapted toengage an automobile Wheel to revolve the same against the action of itsbrake, a revolving member relatively fixed to said Wheel turning' means,a second revolving member arranged in axial alignment with the lirst oneto revolve concentrically therewith, means for revolving the secondmember, means interposed between said members adapted to permit alimited amount of relative rotation therebteiveen but to transmit adrive from the second member to the first member, means causing axialmovement of said second member upon relative rotation between saidmembers, means resisting` such relative rotation but permitting,r samein direct proportion to the resistance offered to turning by the Wheel,and means for imlicatinp4 the axial movement o'l said second member.

VS. A brake testine; aplvmratus comprising wheel turning means adaptedto engage an automobile Wheel to revolve the saine against the action ofits brake, a revolving member relatively fixed to said Wheel turningmeans. a second revolving member arranged in axial alignment `with tbefirst one to revolve concentrically therewith, means for revolving thesecond member, means interposed beshaft to engage tbevvbeel of enoutcmno7 .to revolve the seme against tlie act-ion of its brake, n cernfixed on seid shaft, n second com tween seid members adapted to permit nlimited amount` of relative rotation therebetween but to transmit adrive from the see ond member to the first member, means onus ing axialmovement of seid second member uponreletive rotation between seid'members, means resisting suoli relative rotation but permitting seme indirect proportionto tbe resistnnceoffored 'to'turning by tbe Wheel, andmeens operated by the n2-iol vmoveA li of thel second member et agreatly incree ed ratio to indicate the eniel movement of seid secondmember. y Y

9. A brake testingL sppsrrtus con'i'pri shaft, i revolvingmember finedon said to engage the Wheel of en automobile toV revolve the seineagainst the action of its'brelre, e cemfixed on said sbeft, second comrotan ably and slidebly mounted on seid shaft contiguous'to the firstcom, ineens for revolving thesecond com, said coms having' contiguouscam feces, means curried by tbe shaft and interposed between seid com`faces adapted to permite limited amount of relative ro 'ion between thecoins but to transmit a Adrive .trom the second cam to tbe first oem,sei-d com faces being formed to cause tbe second com to nieve axiallyupon relative rotation, means yieldably resisting such Aaxial movementof the vsecond com whereby relative movement of the cams and enielmovement of the second resistance offered to turning` by tlie ivheel,

l and means for indicating tbe axial movement of said second com,

10. A brake testing apparatus comprising n. shaft, a revolvino`meinberfixed onV scid' rotatably and slidetblj,7 mounted on said shaftcontiguous to the first cem, L eens for revolving,` the second com, saidcams having; contiguous com faces, means carried by the shaft i vwiths'nid ebember and in which the fluid level changes as tbe volume ofthechamber in changed, and means operatively associated with seid secondcom and said dinpbrngnn to nctuete the letter by the movement of seidsecond com.

1l. A brake testing apparatus comprising; a shaft, a, revolving memberfixed on .fluid slinft to engage tbe ivlieel of en automobile to revolvethe some against tlie notion of its brakdn com fixed on seid slifift, :Lsecond cuni rotatably and slidsbly mourned on seid shaft contiguous tothe first com, ineensl for revolving the second cem, seid coms -bnvingcon tiguous com faces, means carried by the slm-ft and interposedbetween cam faces adopt ed to permit n limited amount of relativerotzr-tion between the Cenis but to transmit a drive from tbe second comto tbe rst com, seid com faces Ybeing` formed to causo the second com tomove axially upon relative rotation, means yieldnbly resisting' suchaxial Amovement of the second com ivliereby relative moi/ement of thecams and sxinl movement of the second com will occur in directproportion to tbe resistance offered to turning` by the Wheel, end moonsopersted by the axial movement of said second com :it :i grentlyincrensed ratio to indicate tbe :miel more ment of the second cam.

RICHARD F. DANIELS.

